Method of making commutators.



V. G. APPLE.

METHOD OF MAKING COMMUTATORS.

APPLICATION FILED 8.14.1918.

1,276,856. Patented Aug. 27, 1918.

Wesaea: T figefgfi wncnnr e. APB-LE, orfzoarron, OHIO.

METHOD (IF-MAKING COMMUTATORS.

p ification of Letters Patent Patented Aug. 27,1918.

Application filed February 14, 1918, Serial No. 217,148.

Tora'll whom it may concern:

"Be it known that I, VINCENT G. Armin, a citizen'of the United States, residing at Dayton, in,the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Methods of Making Commutators, of which the following isa specification.

My invention relates to improvements in the method of making commutators for dynamojele'ctric machines. I

One of vthe objects of my invention [isto providea method of making a commutator and the conducting bars of a dynamo electric machinein one integral unit.

Another object of the invention is to make the conductin bars of such configuration at their ends be orebeing placed on the armature core, that each pair will, jointly, when welded together, form the outlines of a truncatedcone or, a commutator segment, thereby providing a commutator of the ends of the co d ctors tha P o f m h ture core, which is entirely supported by the core.

And another object of my invention is to provide a method of making a commutator whereby the interior and exterior circumferential surfaces may be utilized, for contact by the commutator collecting brushes.

Other and further objects of my invention will become apparent from a consideration of the following description when taken in connection with the drawings, wherein Figure 1 is a section through an armature core showing a pair of conductor bar terminals projecting from the end thereof and be ing welded together in pairs to form of each pair a commutator segment.

Fig. 2 is a section taken on line 22 of Fig. 1 showin the terminals of the armature being we ded together in pairs, without forming a commutator.

Fig. 3 is a transverse section through a pair of enlarged armature terminals show- 1 ing them ready to form a commutatorsection, before being welded together.

Figs. 4 and 5 are modifications.

Fig. 6 is an end view of a part of the finished commutator.

In all the views the same reference characters are employed to indicate similar parts; ,7

I have shown a schematic arrangement of the means for electrically welding the parts together. In the disclosure, 10 is the core of an armature, a starter, orthe, like, showng a pair of conducting'bars 11 andx12 pro- ]ect ng from the end, as at 13 and 141. The prO ecting ends are, preferably, enlarged through a radial plane to compensate for reduction in dimensions due to pressure when weld ng, and to fill the inter-bar space that is occupied by insulating'material 15 .in the armature. 1

The process contemplates welding the terminals together, n the .manner described .to complete electrical continuity between ,at 18 and 19,. where the tenon enters the groove or they may be fiat on their adjoinlng faces, as at 20 and 21. Or the tenon 18 may be longer so that when it softens down by heat, it will be upset by pressure to fill the groove 19, or any other suitable shape may be used.

The welding apparatus is shown to consist of two parallel bars 22 and 23, hinged, as at 24 and 25, respectively, to an. insulating, separating block 26, and yieldingly held separated by the spring 27.

A rod 28 passes through the bars 22 and 23, being insulated by the bushing 29, and carries on its upper end a cam lever 30, by which to apply pressure to the parts to be heated by the electric current which is brought to the welding device by wires 31 and 32, which are secured by clamp nuts 33 and 34:, respectively, to the bars, and which are connected to a source of current, not shown.

To the ends of the bars 22 and 23 are connector shoes 35 and 36, respectively, which are narrowed at their contacting sides to dimensions substantially as wide as the members 13 and 14, which are to constitute the joined terminals or the commutator segments 37 when the welding process has been completed. These shoes may be made of a metal that, does readily respond to the welding process at the relatively low temperature at which copper is readily welded. The Welding apparatus is applied, as shown,

to a pair of projecting armature terminals;

the circuit is closed and the handle 30 is gradually turned from left to right, as the metals soften, to press the terminals together. The circuit is then opened and another pair is welded in the same manner, until the entire numbers of pairs have been welded or the commutator has thus been made.

The spaces between adjacent commutator segments may be left open or filled with any suitable insulating material when the terminals are used for commutating purposes.

While I have shown a. conventional representation of a welding device, it is manifest that my invention is not limited to the means employed, but resides in the method of procedure.

Having described my invention, what I claim is 1. The art of joining separated armature conductors together in radially disposed pairs at their ends beyond the core, which consists in increasing the cubic area of copper in their ends and welding same together by application of electric current and pressure.

2. The art of making commutators which consists in enlarging the ends of armature conducting bars to compensate for reduction in size due to welding; placing them on an armature core with said ends projecting beyond the end of the core; applying a current of electricity to soften the ends and applying pressure to cause adhesion of the parts.

3. The art of making commutators which consists in enlarging the ends of armature conducting bars, so that radially disposed pairs, when placed on a core and welded together, will form properly shaped commutator segments; supporting said bars on a core in radially disposed pairs, with their enlarged ends projecting axially beyond the core end and electrically welding the pairs together. j 45 4. The art of making comm utators which consists in enlarging the ends of armature conducting bars; shaping them so that pairs located in radial planes on an armature, when welded together, will have an outline of a truncated cone; placing them on an armature with their ends pro ecting beyond the core in radial pairs, with the larger end of one conductor pairing with the smaller end of another conductor and welding the 55 conductors of the pairs together.

h In1 testimony whereof I hereunto set my VINCENT G. APPLE.

Copies of this patent may be obtained for five cents mg, by addressing the Commissioner of ratenu, Washingtonfll. G. 

